Phonograph-record mold.



A. F. WURTH.

PHONOGRAPH RECORD MOLD.

APPLICATION FILED 0018, 1908.

1,027,788. Patented May 28, 1912.

- UNITE STATES PATENT oFnIoE. I

ALBERT E. WURTH, o' ORANGE NEW JER ronATIoN on NEW JERSEY.

PHONQGRAPH-RECORD mom).

Specification iiette'rs Patent.

s Y, AssIGNoR, BY MESNE ASSIGNMENTS, J TO THOMAS A. EDISON,'INCORPORATED, or WEST ORANGE, NEW JERSEY, 4e03,

' 4 Application filed October 8, 1508. Serial No. 456,697.

To all whom it may concern:

.Be it'known that I, Annnn'r F. \VUn'rI-I, a

citizen offthe United States, and a resident of Orange,-in the county. of Essex and State of New Jersey, have invented certain new and useful Improvements in-Phonograph- RecordMo1ds,-of which the following is 'a specification My' invention relates to phonograph rec- 0 ord moldsonmatrices of' tubular form, and

has for its object the provision of a removable end piece therefor, improved locking means being provided for preventing the reniora'l'of-said end pieee, said means being i capable ofibe ngreadily unlocked whenei'er '.it is desired the mold. t t Y r I In order'tha't the invention may be more clearly understood, reference is hereby made toreniove the end piece from to the accompanying drawing, of which-- Figure 1 is an end view of a tubular mold having an end piece constructed in accordance witltmy invention and locked thereto;

Fig. 2 is .a' similar view showin the manner in which the end piece is unloc ted from the mold; Fig. 3 is a section on line 3-3 of Fig. 2, and Fig. 4 is a detail view showing the key or instrument for unlocking the end'piece and the ball which forms a part of the lock.

in the structi'n'e shown the matrix or mold 1 is of tubular form and carries upon its bore a negative representation of a )hono g 'aph sound record, said mold being tormed with an internal flange 2, and thebore of said moldbeyond said flange being threaded as shown at 3. The end piece 4 is threaded at- 5 to engage the thread 3, and has a recess or socket (3 within which is placed a spiral spring, 7, one end of the same abutting against the bottom of said recess, anda ball 8 is placed in said recess against the other end'of said sprin 'lhe: recess (3 preferably" inwardly in a direction contrary to that in.

whiclr the. end piece moves when being screwed into place. There is an opening or key-hole 9 extending into the end piece in a directiontransverse to that of the recess formed with a sloping surface12. 1

The spring Tand ball '8 having beenplaced I I within the recess 6, the end piece 4 1s appiied-to the mold and rotated inthe direc-" (Fig. 1 wherethe thread 3 of. is screwed into I 'tion indicated by the arrow by the thread 5 engages with the mold, and t he end piece the position shown -in Fig. 3. Duringth without binding. '11 now tempt to rotate the end ventsrotation. .The'end piecemay be 11n-- locked by inserting the end .o fgthe 'key Patented M ize, 1912.1

6 and of a size suitable foi receiving the I duced end 10 of the key 11, said end being lllinto the hole 9 in such .posit-ionxthat :the'

inclined surface 12 contacts wifliflthe-balltd l and moves it away from the thread 3' as. 15'

shown in Fig. 2. The ball'being=tl1i1sihld, the end mold.

Instead of using a ball or sphere 8 mov f v piece may be unscrewed :froin the able blocks of other form may 'beemployed,"

to "cooperate with the wedging snrfacelQf I claim is:

1. In phonograph molding apparatus,= tlie f;

eoi'nbinat-ion with a cylindrical record mold provided with an internal flange near'one end thereof and internally screw-threaded beyond the said flange, of a circular end piece having a screw threadedperi hery adapted to be screwed into said mol contactwith said flange, said end piece hav-.

lng arecess extending inwardlfrom' said pe-.

riphery in a line-forming an acute angle with the tangent to said periphery,qa ball I within said recess, and resilient mcansform tuna-ting outward pressure upon said ball,

. substantially as described.

into

2. In phonograph molding apparatus, the

combination with a cylindrical record inold screw threaded lltlJZlCLllt one end thereof,- of

an end piece screw threaded to engage the thread upon said mold, and having a recess I extending from the-circle of'engagementof sa d screw threads in a lme forming an acute angle with the tangent to saidclrole 'Q a movable friction me'mber Within said re cess and spring means Within said recess exertingpressure upon said member to for'ce it into contactwith the-thread on said mold, substantially as described.

3'. In phonograph molding apparatus, the combination with a cylindrical record mold screw threaded adjacent one end thereof, of

an end piece screw threaded to engage the thread upon said moldfa'nd having a recess extending from the circle of engagement of said screw threads in a line forming an acute angle with the tangent to saidcircle, a movab 0 friction member W1th1nsaid recess, and spring means within said recess. exerting pressure upon said member vto force it "into contact with the threadon said-mold,;lsaid end piece having a key hole adjacent said -WVitneSseS:

FRANK D. LEWIS, JOHN M. Carr'rmm. 

